Vent plug for storage batteries



May 15, 1923. 1,455,344

L. LYNDON VENT PLUG FOR STORAGE BATTERIES Filed Sept. 7, 1921 New i,ss,344

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momor maw roman. Y.

VENT rnue non s'ronaen BATTERIES.

Application filed September 7, 1921. Serial No. 499,052.

To allwlwmz'tmay concern:

Be it known that I, LAMAR LYNDON, a. citizen of the United States, and residentof York, in the county and State of New York, have invented certain new and useful Improvements in Vent Plugs for-Storage Batteries, of which the following is a specification.

Myinvention relates to a new and improved vent plug for enclosed secondary or storage batteries. v

As is well known, the means for egress of gases from an enclosed storage battery must so devisedv that the entralned electrolyte is deposited before the gases escape into the open air. The escaping gases. should be as nearly dry as possible, not only because residual moisture would constitute a continuous loss of' electrolyte, but also because this moisture, if deposited on the outside of the cell, is liable to cause short circuits. The desired conditions are not the commercial batteries of today wherein the gases, after entering an expansion chamber, are allowed to escape through vent holes drilled in the filler plug. I Drilling of holes, moreover, and internal-moulding required in the manufacture of existing vent plugs, constitute a comparatively expensive process. M invention provides means for acscription of my invention.

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complis ing the desired results which are not only an improvement from an operating standpoint, but from the standpoint of simplicity and cheapness, also. M vent plu is solid, in the sense that no rilling of oles and no internal moulding are required in my invention. At the same time, my invention provides means whereby what ever moisture may have escaped from the cell is allowed to drain back into the cell. Another important feature of my invention is that any will, also Other nove and useful the detailed deow into the cell. features will appear from Referring to the accompanying drawings:

Figure 1 is a vertical cross section of the up r art of 'an enclosed storage battery igures 2 and 3 are, respectively, a partial and a complete cross section of the vent plug shown in Figure 1. Figure 4.- is a bottom view of this vent plug. The remaining Figures, 5 to 10, are cross sections of other forms of m invention.

Referring par lfllfllly to Figure 1, 1 1s a tween.

entirely met in of in the vent plug.

electrolyte that may have been illed while filling the. batte and said vent containing cell; 2 and 2" are lugs of a pair of plates, one positive and the other negative; 3 and 3" are portions of the corresponding terminal ports; 4 is the cover of the cell sealed to the containing jar in the usual manner; 5 is the solid vent or filler plug. The portion of the solid vent plug which fits into the filler opening is threaded at its upper and lower ends, leaving an unthreaded portion of smaller diameter in be- The space between the said unthreaded ortion of the plug and the filler opening oi the cell covcr'forms an expansion chamber for the escaping gases. The internal surface of the boss 6, which is a part of the cell cover 4, is threaded to receive the solid vent plug. The threads of the solid plug are broken at diametrically opposite sides,'as is clearly seen in Figure 3, formin grooves for the passage of the gases whicg enter from the cell at 7 and escape into the openair at 8, and whose course is indicated by arrows in the several figures.

Various modifications may be madein the design of my invention without changing its general principle. In Figure 5, only the lower end of the solid plug is threaded. In Figure 6, only theupper part of the rtion of the solid plug which fits into the filler opening is threaded. while the grooves are made in the boss of the cell cover instead In Figure 7, a bayonet joint replaces the thread. 'In Fi re 8, the expansion chamber extends all t e way to the solid plug cap. In Figure 9, this expansion chamber is cut out of the boss. Finally," in Figure 10, a different mode of exit for the gases is indicated.

It will be noted that the opening for the final exit ofgases is flush with the upper claim aving duly described my invention, 1

e 1. In an enclosed storage battery having a filler opening, venting means, including: solid vent plug and an expansion cham r between the surface of said filler opening lug. 2. In an enclosed storage bawery, venting means, including a solid vent plug and an expansion chamber surroundinga portion of said plug.

3. In an encldsed storage battery having afiller opening, a-solid vent plug, a portion of said plug having a diameter smaller than the diameter of said filler opening.

4. In an'enclosed storage battery having a filler opening, venting means including a vent plug and a passage way for gases into the open air, said passage way being formed between the surface of said filler opening and said vent lug.

5. In an enc osed storage battery, venting means comprising a solid vent plug, an expansion chamber and two openings;

a filler opening, a

6. In a storage battery having a cover and a filler hole in said cover, venting means comprising a vent plug, an expansion chamber, an :opening into said chamber and another opening therefrom, saidchamber and said two openin s being formed between the surfaces of sai cover and filler hole, and said vent plug.

7. In a storage battery, venting means including a vent plug and two openings, said openings being formed by grooves in saisd plug.

said plug having the same diameter as said filler hole, and another portion having a, diameter smaller than the diameter of said.

filler hole, and grooves in that portion of said vent plug which has the same diameter as the filler hole.

9. In an enclosed storage battery having filler plug, removably n an enclosed storage battery having a filler hole, a solid vent plug, a portion of between said plug and the surface 0 emma fitted into said openimg, and venting means disposed between said plug and the surface of said opening, said openin being flush with the external surface 0 the attery cover.

10. In a storage battery, the combination with a cell cover having a depressed portion, of a filler opening in said depressed portion,

and a solid vent plug removably fitted into said opening. y

11. In a storage battery cover having a threaded opening, a solid vent plug having a correspondingly threaded portion adapted to be received by said cover opening, and a' ternal surface of said cover for the exit of said gases into the, open air.

13. In a storage battery, the combination with a cell cover having a depressed portion, of a filler opening in'said depressed ortion a filler plug, and venting means isposed opening. a

New York, September 6th, 1921 said 7 

